How do I blank the screen while an app is open?

[AC Question]

When using Google Maps on my phone during a long trip, how do I shut down the display to conserve battery without having to reenter my password to bring it back? I am using Android 6.0.1.

 

[Tim1954]

You could dim the display right down.
Or in settings... accessibility.... Vision... Dark screen
That function turns off the display while things are still going on.. Double pressing power button toggles it on/off. Not sure if that would suit your needs.
I have my S7 in the centre console, sitting on a wireless charging pad with the lid closed. When I navigate, I just follow the voice, so I can see the usefulness of screen off.

 

[B. Diddy]

Welcome to Android Central! This is in a car, right? Why not just keep it plugged into the car charger while you're using it during the trip?